721126051 has 8 divisors (see below), whose sum is σ = 725587200. Its totient is φ = 716673672.

The previous prime is 721126013. The next prime is 721126073. The reversal of 721126051 is 150621127.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-721126051 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (721124051) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 241896 + ... + 244858.

It is an arithmetic number, because the mean of its divisors is an integer number (90698400).

Almost surely, 2^721126051 is an apocalyptic number.

721126051 is a deficient number, since it is larger than the sum of its proper divisors (4461149).

721126051 is a wasteful number, since it uses less digits than its factorization.

721126051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4385.

The product of its (nonzero) digits is 840, while the sum is 25.

The square root of 721126051 is about 26853.7902538915. The cubic root of 721126051 is about 896.7479550381.

Adding to 721126051 its reverse (150621127), we get a palindrome (871747178).

The spelling of 721126051 in words is "seven hundred twenty-one million, one hundred twenty-six thousand, fifty-one".